Length-stop.



w. L. SCHELLENBACH.

LENGTH STOP. APPLICATION men JUNE 14,. 1915.

Patented; Dec. 14, 1915.

IL 9 wwm.

Qwi tueoom I tools having a rrn same nann r ro -union WILLIAM SGHELLENBACH, HARTWELL, OHIO.

LENGTH-STOP.

weasel.

To all whom it may concern:

Be it known that 1,,WILLIAM L. SGHELLEN- BACH, a citizen of the United States, and residing at Hartwell, in the county of Hamilton and State of Ohio, have invented a newand useful Improvement in Length-Stops, of

specification is a full of the bed, and also to provide'means, for

supporting the stop-bar from the carriage or feed member. p

Another object of the invention is to support the stop bar, from tion to be engaged by an apron member. The stop bar is stationary normally, the carriage'being slidable relative thereto, but the bar is moved with the carriage when the carriage engaging member hitsthe stop, the movement of the stop bar being translated to unclutch the lead shaft from its driving member, and so automatically arresting the -.carriage feed. c

The principle of the invention'may bevariously modified or adaptedto different specific embodiments. f

It is afurther object to provide a specific modification of the step-like telescoping stopdogs.

The

vention as applied to the carriage andapron of a conventional engine lathe, in Figure 1 .is a front elevation. of-a lathelem; bodying my improved stop mechanism. -Fig.' ,7

2 is anenlarged right hand elevationffof lever.

y In the drawings, 1 represents the lathe bed having the usual \i-ways upon which the tool carria e 2 slides. Depending from the front edge 0 the carriage is the apron 3 inclosing the transmission gear train. This gear train Specification of Letters Patent.

automatic of the invention is to avoid along stop bar, extending full lengththe apron, in posi-' ported --telescoping type and v tioned on the bar relative to the particular duration'and sequence of tooling operationsfeatures will be understood in connec- I Secured to the left hand;-

tionwith the description of .the accompanying drawings, forminga part of this spec'i-Q fication, and showing the principle of the in-f.

Patented Dec. 14, 1215..

Application filed June 14, 1915. Serial No. 33,934.

transmits motion from the lead shaft 4 through the beveled gear and pinion 5, 6, the reducing gears 7 8, 9, 10, to the rack pinion 11 which meshes with the stationary rack 12 and propels the tool carriage.

The lead shaft 4 is driven by the gears 13, 14, the gear 13 meshing with the-head-stock spindle gear 15. The gear 14 is loosely journaled on the lead shaft and is provided with clutch teeth 16 which intermesh with companion clutch teeth of aclutch collar 17 fixed to the lead shaft. The lead shaft 4 is slidably mounted in brackets 18, 19, secured to the lathe bed a id is normally shifted toward tlie right, withv the clutch teeth in driving.

engagement, by the spring 20, said spring belng interposed between the bracket 18 and a collar 21 fixed on the shaft.

It will, of course, be understood that the shaft 4 has the key slot 22 extending throughout the major portion of its length and that the beveled pinion 5,is' keyed thereto as is the usual practicein this type of lathe.

The mechanismntilized for shifting the lead shaft to unclutch the driving gear 14, and'thereby arrest the travel of the tool carriage, consists of a stop bar 25 slidably supin a grooved bracket 26 .detachably bolted to the under surface of the apron, said bar having a dove-tailed upper surfaceto which is secured a series of stop-dogs 27.

These dogs are preferably of the well-known. are coordinately posito be performed, v end of the stop bar 25 is a bracket28 which extends upwardlyand terminates with a colla rg29-loosely surrounding the lead shaft 4 g and"normallyengagmg a collar 30 adjust- .ably; secured to vsaid'shaft. Said collar is adjusted laterallyrelative to the maximum car- Yriage travel necessary for a given piece of the apron. Fig. 3 isa fragmentary front; elevation of a portion "of the apronshowing; a modified form of stop dogs and abutment w bracket 28 and engaglng the beveled end 30 ofthe collar. The opposite end of said collar is also beveled to permit the detent to ride over said collar when the stop rod assumes its normal pos tion, as shown, after a readjustment of the collar.-

work. The machine is then started and the carriage travels toward the head-stock until the abutment lever contacts with the first stop dog27. The abutting of the abutment lever 31 against the stop dog will, translate the stop bar 25, .and with it the lead. shaft 4 to the left, thereby unclutching the clutch collar 17 from the clutch teeth 16 of the gear '14. This discontinues the feed of the lead in stationarv shaft and stops the carriage. The abutment lever is then the first stop dog and the spring 20 .automatically restores the stop bar and lead shaft to normal position, and again throws in the clutch to restart the carriage feed. When the abutment lever contacts with the second stop dog, the same unclutching operation is repeated. The collar 21' mayabut' the bracket 18 to form a stop for the lateral shift of the lead shaft. i

The modification shown in Fig. 3 shows stop dogs of different height cooperating with a stepped abutment plate 31 secured to the abutment lever. Each of'the steps of this plate can be raised with its companion stop dog.

member, and a clutch controlled driver for said shaft, a stop bar supported by said feed member, means holding said bar normally position, a stop-engager on the feed member, tion imparted to the bar through the stopengager-to operate said clutch and arrest the feed of said member.

2. In a machine of the class'described, a bed, a longitudinally reciprocating feed member thereon, a feedshaft on the bed, means actuated by said shaft for feeding said member, and a clutch controlleddriver for said shaft, a slide-way supported on said a stop-bar suspended on said slide-way support parallel with said shaft, means for normally holding said bar stationary while the feed member is in motion,

. a stop-engager on the feed member, and conhection between said bar holding means and said clutch control for operating the clutch the stop the shifting of the feed shaft, a

raised out. of engagement with.

out of alinement with its companion stop dog without disalining on the bed, means Y actuated by said shaft for feeding said and means for translating H10 automatic length stop comprising a 3. In a device of the class described, a

.bed, a longitudinally reciprocating feed member thereon, alongitudinally shiftable feed shaft on the bed, means'actuated by said shaft for feeding said member along the bed, a clutch 'eontrolled driver for said shaft, a coacting. clutch member actuated by slide-way support on the feed member, astop bar suspended in said support parallel with the feed shaft, a device. on the'feed shaft and longitudinally movable therewith for holding said bar normally stationary while the feed member is operating between stop points, and a stop-engager on said feed mem- "ber adapted to move the stop bar, feed member and feed shaft in unisonto unclutch the feed shaft ,at predetermined points in the path ofmotion of the feed member.

4'. In a device ofthefclass described, a bed, a longitudinally reciprocating feed member thereon, a longitudinally shiftable feed shaft on. the bed, means actuated by said shaft for feeding saidmember' along the .bed, a clutch controlled driver for said shaft, a coacting clutch. member actuated by the shifting offthe feed shaft, a slide-way support on the feed member, a stop bar suspended in said support parallel with the feed shaft, a device on thelfeed shaft and longitudinally movable therewith for holding said bar normally stationary while the feed member is operating between stop points,; means for adjustably securing the said device lengthwise 'ofthe feed shaft to determi the selective operative position of the stop ar, and a stop-.engager on said feed member adapted to movethe stop-bar, feed member and .feed shaft in unison to unclutch the feed shaft at predetermined points in the path of mo-tion of the feed member.

5. In a device of the class described, a clutch controlled feed member, a bar normally stationary relative of said feed member,but movable therewith at predetermined-points to operate the clutch, a series of step-like stop dogs longitudinally adjustable on said bar, adapted to be brought into end to. end and non-overlapto the movement 1 ping contact, and astop-engager on the feed mechanism adaptedto be adjusted into or out of position" for doggengagement, said stop-engager having a series of stepped abutments corresponding; '.theistop arrangementof said dogs-{each of said abutment stops being positioned to coact with its re- 7 spectively stepped stop dog.

6. In combination with a carriage,

apron and apron mechanism of an engine lathe, an

stopbar supported by the apron, said apron sup port and bar' being arranged for relative slide movement, a stop-engager on the apron,

feed mechanism for the apron, means causmy name, as attested by the two subscribing ing said stop-bar and stop-engager' to in- Witnesses. tercept at redetermined points in the ath I v of apron HELVQL' and means actuated by said' WILLIAM EL 5 interception rendering the apron feed mech- \Vitnesses:

anism in0perative.- EMMA SPENCER,

In witness whereof, I hereunto subscribe L. A. BECK. 

